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By Brian Rohrig
A large amount of the foods we eat contains food colorings.
We tell you where they come from, how they work, and
the difference between natural and artificial food colorings.Teacher's GuideSpanish Translation

DollarPhotoClub.com

Tooth Decay: A Delicate Balance

By David Warmflash
When a tooth decay occurs, some of the white, outer layer of
the tooth, or enamel, starts to dissolve. Learn more about this
process and how chemical solutions in our mouths, called
buffers, help to prevent tooth decay.Available in the print issueTeacher's Guide

Jack Spellman

Probiotics: Good Bacteria, Good Health

By Gail Kay Haines
Bacteria are not all bad. Some of them are essential to human
digestion, provide energy, and back up the immune system.
Learn about the foods and beverages that contain these bacteria
and how they can help improve your health.Available in the print issueTeacher's Guide

DollarPhotoClub.com

Dirt? Who Needs It? How Hydroponics Is Poised to Change the World

By Mallory Pickett
The amount of land suitable for agriculture, and the stores of
water needed to grow crops are shrinking. So, how will people
feed themselves in the future? Hydroponics, a type of agriculture
that does not use soil, may provide a solution.Available in the print issueTeacher's Guide

Hidden Ocean Expedition 2005/NOAA/OAR/OER

Light in the Cellar of the Sea

By Linda Zajac
The deep sea is a place of bone-chilling water and near-total
darkness. Yet, marine organisms emit light to either find food
or attract prey. Little is known about them, but marine scientists
are slowly revealing many of their secrets.Available in the print issueTeacher's Guide